Ceramic foam filter is been made by specific procedures and have peculiar bone-frame holes just like the shape of foam (Called three-dimensional connected channel) and myriad eyelets which only been found in big times microscope.

Block set is a round cap made with high temperature resistance fiberglass. it block the stove and mould mouth to avoid molten aluminum overflow in the aluminum casting industry.
working temperature is about 1200 Degree Celsius
the size is changeable ac